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authorNick Piggin <npiggin@kernel.dk>2010-08-18 04:37:34 +1000
committerAl Viro <viro@zeniv.linux.org.uk>2010-08-18 08:35:47 -0400
commitb04f784e5d19ed58892833dae845738972cea260 (patch)
tree6060e063b5a51461fd60630d57318778fe987148 /fs/file_table.c
parent2a4419b5b2a77f3f4537c14f7ad7df95770655dd (diff)
downloadlinux-b04f784e5d19ed58892833dae845738972cea260.tar.bz2
fs: remove extra lookup in __lookup_hash
fs: remove extra lookup in __lookup_hash Optimize lookup for create operations, where no dentry should often be common-case. In cases where it is not, such as unlink, the added overhead is much smaller than the removed. Also, move comments about __d_lookup racyness to the __d_lookup call site. d_lookup is intuitive; __d_lookup is what needs commenting. So in that same vein, add kerneldoc comments to __d_lookup and clean up some of the comments: - We are interested in how the RCU lookup works here, particularly with renames. Make that explicit, and point to the document where it is explained in more detail. - RCU is pretty standard now, and macros make implementations pretty mindless. If we want to know about RCU barrier details, we look in RCU code. - Delete some boring legacy comments because we don't care much about how the code used to work, more about the interesting parts of how it works now. So comments about lazy LRU may be interesting, but would better be done in the LRU or refcount management code. Signed-off-by: Nick Piggin <npiggin@kernel.dk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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